php - simplexml_load_file not showing all xml attributes

I'm trying to pull xml data from some link withsimplexml_load_file.
This one xml node I am trying to access is an array with 4 elements.
Each element has a label which I am trying to read.
I try to read each label using theattributes() function, but for some reason the function only returns the first node label.

// Get data from link
$link = "https://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=pubmed&id=12120,34323121&retmode=xml";
$xml = simplexml_load_file($link);

// Try to print attributes:
echo "<pre>";
print_r2($xml->PubmedArticle[1]->MedlineCitation->Article->Abstract->AbstractText->attributes())
echo "</pre>";
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Result:

SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [Label] => BACKGROUND
            [NlmCategory] => BACKGROUND
        )

)
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This is the XML from the link. There is a label for each node:BACKGROUND, METHODS, RESULTS, CONCLUSION AND RELEVANCE

<AbstractText Label="BACKGROUND" NlmCategory="BACKGROUND">
Extracorporeal membrane oxygenation (ECMO) is a potential option for the management of severe acute respiratory failure secondary to COVID-19. Conflicting the use of this therapy is the known coagulopathy within COVID-19, leading to an incidence of venous thrombotic events of 25% to 49%. To date, limited guidance is available on optimal anticoagulation strategies in this population.</AbstractText><AbstractText Label="OBJECTIVE" NlmCategory="OBJECTIVE">The purpose of this study was to evaluate the utilization of a pharmacist-driven bivalirudin dosing protocol for anticoagulation in the setting of ECMO for COVID-19-associated respiratory failure.
</AbstractText>
<AbstractText Label="METHODS" NlmCategory="METHODS">
This was a single-center retrospective chart review over a 9-month period of patients receiving bivalirudin while on ECMO. All patients with acute respiratory failure requiring ECMO with a positive SARS-CoV-2 polymerase chain reaction were included. Bivalirudin was dosed via aPTT monitoring after a starting dose of 0.2 or 0.3 mg/kg/h.
</AbstractText>
<AbstractText Label="RESULTS" NlmCategory="RESULTS">
There were 33 patients included in this study, all receiving mechanical ventilation. The most common starting dose of bivalirudin was 0.2 mg/kg/h, with an average time to therapeutic range of 20 hours. Compared to previous reports, rates of bleeding were low at 15.1%, and 6.1% of patients developed a new venous thromboembolic event while on ECMO. ECMO survival was 51.5%, with an ICU mortality rate of 48.5%.
</AbstractText>
<AbstractText Label="CONCLUSION AND RELEVANCE" NlmCategory="UNASSIGNED">
In the first published report of its use within this population, bivalirudin was found to be a viable choice for anticoagulation in those patients on ECMO for severe respiratory failure secondary to COVID-19.
</AbstractText>
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Could anyone please tell me why I'm not getting all of the labels from theattributes function?

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